Novice needs help with slicing section off a tapered cue
A couple of ways I might do this:


Using the KNIFE tool with Cut-Through enabled (K, then Z) to slice through the mesh at your desired angle. Though note this is likely to result in Tri's or Ngon faces, which might not work well if you have a subsurf on the mesh.

Select the faces you need to flatten and use the 'Flatten' command (press space, search flatten) - then rotate the selection or use proportional editing to move the flattened faces to the desired angle.




Hope this helps!